Greater Manchester Police said the incident was an "appalling attack" and said the offender was described as black or Asian, 5ft 8in tall and wearing a dark hooded top.

The boy was selling poppies ahead of Remembrance Day

The attacker seemed to be under the influence of alcohol, and was staggering, police added.

Detective Inspector Liam Boden said: "This is an absolutely appalling attack on a young man who was raising money to help remember all those who gave their lives fighting bravely for their country. Whatever his motivation, his violent actions could have scarred this young man for life.

"Although he has suffered some minor injuries, it is pure luck that he did not sustain more serious burns to his face and body.

"Understandably both he and his family are in a state of total shock and cannot believe someone would do this."